7846A MAXWELL | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 11

Technical content

All data sheets are subject to change without notice (619) 503-3300 - Fax: (619) 503-3301- www.maxwell.com 16-Bit Digital to Analog Converter 7846A ©2003 Maxwell Technologies All rights reserved.

05.29.03 REV 5

FEATURES:

  • R AD-PAK® technology-hardened against natural space radiation  Total dose hardness: - > 100 krad (Si), depending upon space mission  Excellent Single Event Effects - SELTH > 114 MeV/mg/cm2 - SEU < 8 MeV/mg/cm2  Package: -28 pin RAD-PAK® Flat Pack  Microprocessor compatible with readback capability  16-Bit monotonicity over temperature  ±2 LSBs integral linearity error  Unipolar or bipolar output  Multiplying capability  Low power (100 mW typical) DESCRIPTION: Maxwell Technologies’ 7846A 16-Bit DAC converter microcir- cuit features a greater than 100 krad (Si) total dose tolerance, depending upon space mission. The 7846A has V REF+ and VREF- reference inputs and an on-chip output amplifier which gives the option of unipolar or bipolar output. The 7846A uses a segmented architecture. The 4 MSBs in the DAC latch select one of the segments in a 16-resistor string. Both taps of the segment are buffered by amplifiers and fed to a 12-bit DAC, which provides a further 12 bits of resolution. This archi- tecture ensures 16-bit monotonicity. Excellent integral linearity results from tight matching between the input offset voltages of the two buffer amplifiers. In addition to the excellent accu- racy specifications, the 7846A also offers a comprehensive microprocessor interface. There are 16 data I/O pins, plus control lines (CS , R/W, LDAC and CLR ). R/W and CS have readback function which allows writing to and reading from the I/O latch. Maxwell Technologies' patented R AD-PAK® packaging technol- ogy incorporates radiation shielding in the microcircuit pack- age. It eliminates the need for box shielding while providing the required radiation shielding for a lifetime in orbit or space mission. In a GEO orbit, R AD-PAK provides greater than 100 krad (Si) radiation dose tolerance. This product is available with screening up to Class S. Segment Switch Matrix Control Logic I/O Latch DAC Latch 12-bit DAC R R 203109 21 4 VDDVCC VREF+ VREF- VSS DB15 DB0 DGND CLR LDAC R/W CS VOUT RIN R R R Logic Diagram 7846A

TABLE 1. 7846A PINOUT DESCRIPTION 1-3 DB2-DB0 Data I/O pins. DB0 is LSB. 4V DD Positive supply for analog circuitry. This is +15V nominal. 5V OUT DAC output voltage pin. to select output voltage ranges. 7V REF+ VREF+ Input. The DAC is specified for VREF+ = +5V. 9V SS Negative supply for the analog circuitry. This is -15V nominal. 10-19 DB15-DB6 Data I/O pins. DB15 is MSB. 20 DGND Ground pin for digital circuitry. 21 V CC Positive supply for digital circuitry. This is +5V nominal. back the DAC latch contents. 23 CS Chip select input. This selects the device. 25 LDAC Asynchronous load input to DAC. 26-28 DB5-DB3 Data I/O pins.

TABLE 2. 7846A ABSOLUTE MAXIMUM RATINGS 1

  1. Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress

affect device reliability. Only one absolute maximum rating may be applied at any one time.

  1. V OUT may be shorted to DGND, VDD, VSS and VCC provided that the power dissipation of the package is not exceeded.

TABLE 3. DELTA LIMITS IDD ±10% of value specified in Table 4. IEE ±10% of value specified in Table 4. ICC ±10% of value specified in Table 4.

TABLE 4. 7846A ELECTRICAL SPECIFICATIONS 1

  1. Sample tested to ensure compliance.
  2. 7846ARP is functional with power supplies of ±12V. See typical performance curves.
  3. Sensitivity to Gain Error, Offset Error and Bipolar Zero Error to V

TABLE 5. 7846A AC PERFORMANCE CHARACTERISTICS1 AC Feed through V REF-=0V, VREF+=1V rms, 10kHz sine wave. TABLE 4. 7846A ELECTRICAL SPECIFICATIONS 1

TABLE 6. 7846A T IMING C HARACTERISTICS1,2,3,4

  1. Guaranteed by design. All input control signals are specified with t R = tF = 5ns (10% to 90% of +5V) and timed from a voltage
  2. t 6 is measured with the load circuits of Figure 1 and defined as the time required for an output to cross 0.8V or 2.4V.
  3. t 7 is defined as the time required for an output to change 0.5V when loaded with the circuits of Figure 2. Specifications subject to

FIGURE 1. LOAD CIRCUITS FOR ACCESS TIME (t6) FIGURE 2. LOAD CIRCUITS FOR BUS RELINQUISH TIME (t7) FIGURE 3. 16-BIT DIGITAL TO ANALOG CONVERTER

8All data sheets are subject to change without notice ©2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846A

9All data sheets are subject to change without notice ©2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846A Note: All dimensions in inches

28 PIN RAD-PAK® FLAT PACKAGE

A 0.190 0.207 0.224 b 0.015 0.017 0.022 c 0.004 0.005 0.009 D -- 0.720 0.740 E 0.380 0.410 0.420 E1 -- -- 0.440 E2 0.180 0.250 -- E3 0.030 0.080 -- e 0.050 BSC L 0.360 0.370 0.380 Q 0.062 0.073 0.081 S1 0.000 0.027 -- N2 8

10All data sheets are subject to change without notice ©2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846A Important Notice: These data sheets are created using the chip manufacturers published specifications. Maxwell Technologies verifies functionality by testing key parameters either by 100% testing, sample testing or characterization. The specifications presented within these data sheets represent the latest and most accurate information available to date. However, these specifications are subject to change without notice and Maxwell Technologies assumes no responsibility for the use of this information. Maxwell Technologies’ products are not authorized for use as critical components in life support devices or systems without express written approval from Maxwell Technologies. Any claim against Maxwell Technologies must be made within 90 days from the date of shipment from Maxwell Tech- nologies. Maxwell Technologies’ liability shall be limited to replacement of defective parts.

11All data sheets are subject to change without notice ©2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846A Feature Option Details7846A RP F X Screening Flow Package Radiation Feature Base Product Nomenclature Monolithic S = Maxwell Class S B = Maxwell Class B I = Industrial (testing @ -55°C, +25°C, +125°C) E = Engineering (testing @ +25°C) F = Flat Pack RP = R AD-PAK® package 16-Bit Digital to Analog Converter